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我有文件下载PHP脚本。该脚本可以下载最大4GB +的大文件。实际上,用户将经常会取消下载过程或在下载时关闭浏览器窗口。PHP Connection_Aborted()仅适用于有时
因此,我必须在已经开始的下载过程因任何原因而中止时注册。对此的最佳解决方案看起来是通过connection_aborted()函数监视连接。
'connection_aborted()'似乎对下载取消或关闭我的浏览器窗口有反应。我的问题是,它不会以100%的精度做出反应。它注册了约50%的取消下载或关闭的浏览器。如果未检测到连接中止,则只需在服务器上继续下载,就好像浏览器不会取消它一样。
请问我的代码是否存在漏洞和错误?我需要了解,是什么原因导致的行为:
// empty and turn off output buffering
ob_flush();
flush();
// never expire this download script
set_time_limit(0);
fseek($fileObject, $seek_start);
while(!feof($fileObject))
{
//usleep(100000);
//print(@fread($fileObject, $chunkSize));
echo(@fread($fileObject, $chunkSize));
// gradually output buffer to avoid memory problems by downloading large files
ob_flush();
flush();
// check if the client was disconnected
// important for cancelled or interrupted downloads
if (Connection_Aborted())
{
ChromePhp::log("Connection Aborted");
// sent to the database that the connection has been aborted
$result = mysqli_query($dbc, "UPDATE current_downloads SET connection_aborted=TRUE WHERE user_id=1;");
// close the database connection
mysqli_close($dbc);
// close the open file
@fclose($fileObject);
exit(json_encode(array("result" => false, "error" => "Connection with the client was aborted.")));
}
$nLoopCounter++;
$transferred += $chunkSize;
$downloadPercentage = (($nLoopCounter * $chunkSize)/$fileSize) * 100;
$result = mysqli_query($dbc, "UPDATE current_downloads SET progress_percent=$downloadPercentage, transferred=$transferred, connection_aborted=$strConnectionAborted, iteration=$nLoopCounter WHERE user_id=1;");
if($result == false)
{
// close the database connection
mysqli_close($dbc);
// close the file
fclose($handle);
// prepare output message
$outputArray = array("result" => 0, "message" => "Error Processing Database Query");
// output the message
echo json_encode($outputArray);
exit;
}
}
// file save was a success
@fclose($fileObject);
我使用以下命令:
- 的Apache 2.4.4
- PHP 5.4.12
- 的MySQL 5.6.12
- Google Chrome版本32.0.1700.107 m
- Windows 7 x64
谢谢。
Xiongji您好,感谢您的答复。我测试了修改过的if((connection_status()!= 0)||(connection_aborted()!= 0))',但不幸的是没有改变。错误日志也没有显示任何错误。 –